题干
With his eyes _______ on me, he came towards me.
A：fixed
B：fixing
C：to fix
D：were fixed
答案(点此获取答案解析）
A
A：fixed
B：fixing
C：to fix
D：were fixed
、—OH、
、—COOH四种基团两两组合而成的有机物中，其水溶液能使石蕊变红的有